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Loans Receivable - Additional Information (Details) $ in Thousands |  | 3 Months Ended |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) loan branch | Dec. 31, 2020 USD ($) branch | Sep. 30, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accrued interest receivable for loans | $ 47,168 | $ 47,168 | $ 48,704
Loans pledged to secure borrowings from the Federal Home Loan Bank | $ 5,153,478 | 5,153,478 | $ 5,361,504
Nonaccrual interest income recognized |  | 3,489 |
Impaired, interest income on accrual accrual and performed loans |  | $ 402 |
Number of businesses assisted, CARES Act | branch | 6,500 | 6,500 |
Basis point reduction, minimum |  | 1.00% |
Basis point reduction, maximum |  | 2.00% |
Percent of TDRs classified as performing |  | 97.90% |
Single family residential loans as percentage of restructured loans | 92.90% | 92.90% |
Minimum |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Term for payment and rate reduction |  | 6 months |
Maximum |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Term for payment and rate reduction |  | 24 months |
Performing Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Troubled debt restructuring, amount |  | $ 86,314 |
SBA Payroll Protection Program, CARES Act |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Amount of PPP loans authorized, CARES Act |  | 780,000 |
Consumer loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of loans modified | loan | 183 |  |
Total loans modified | $ 46,000 | 46,000 |
Commercial loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of loans modified | loan | 10 |  |
Total loans modified | $ 32,000 | $ 32,000 |

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